Electric spot-welding machine



March 16 1926. 1,577,419

F. M. CUSHING ET AL ELECTRIC SPOT WELDING MACHINE Filed M rch 12, 1923 2 Sheets-Sheet 1 Q1... 29 7 K S 7*"; ll

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gwwzntom Z4- 7 March l6 1926. 1 577 419 F. M. CUSHING ET AL ELECTRIC SPOT WELDING MACHINE File'd March 12. 1923 2 Sheets-Sheet 2 Patented Mar. 16 1926.

UNITED STATES PATENT orrica.

FRANK II. cusnme am) WILLIAM L. n. cusnme, or Los mamas, CAI-41103815..

I ELECTRIC sro'r-wmnmc MAGHINE- To all whom it may concern Be it known that we, FRANK M. (lusnme and WILLIAM L. B. OUsHING,.citizens of the.

United States, residing at Los An eles, in the county of Los 'Angeles and tate of California, have invented certain new and useful Im rovementsin Electric S ot-Weldin Machines; and we do hereby eclare the 0 lowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it apertains to make and use the same, reference ing had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to spot welding machines and has for an object to provide a machine embodying additional and improved features of convenience and elasticity whereby the device may accomplish a greater number of purposes and operate in a greater number of locations than is usually provided.

A further object of the invention is to pro vide a spot-welding machine having electrodes which move relative to each other to,

of one or both of the electrode-carrying devices for the purpose of reaching positions otherwise unavailable.

A further object of the invention is to provide in a spot welding machine an arm with means for raising and lowering the arm into operative position with the lower arm and with improved means for facilitating the lateral movement of the lower arm relative to the upper arm.

With these and other objects in view the invention comprises certain novel elements, parts, units, combinations, mechanical movements and inter-actions, as disclosed in the drawings, together with mechanical and functional equivalents thereof, as will be hereinafter-more fully described and claimed.

In the drawings:

, Figure 1 is a'view of the spot welding machine partly in side elevation, one part of the housing broken away to show the internal construction;

Figure 2 is a view of the spot welding machine in edge elevation, as indicated by arrow 2 at Figure 1; t

Figure 3 is a view of the spot welding machine in edge elevation, as indicated by arrow 3 at Figure 1; Figure 4 is a sectional pers ective detail 1 view of the connection of one 0' the electrode arms with the housing;

Figure 5 is a plan view of a collar employed as a guide and limiting member for the movable arm;

Figure 6 is a perspective view of one of the arms;

Figures 7 and 8 are respectively views in side elevation of the adjustmentsof the arms and electrodes relative to each other;

Figures 9 to 14 inclusive are views in end elevation of the relative positions of the arms and electrodes under varying conditions.

Like characters of reference indicate corresponding parts throughout the several views.

The improved spot welding machine which forms the subject matter of this application s designed for spot welding in relatively inaccessible positions, as the bottom of boxes, boilers and the like and provides means for inserting one arm carrying one electrode 30 with n such box, orthe like, and means for posit oning the electrode carried by another arm in operative position relative to the firstment-ioned arm and electrode upon the exterior, of the box, or the like.

To this end, a housing 20 is provided of such construction, height and material as is found convenient or advantageous. To one s de of this housing20 a rod or tube 21- is rigidly and permanently secured in any approved manner, as by the use of an elbow 22 at (its lower end and an arm 23 at its upper en a Upon this rod or tube 21 a T-coupling 24 is mounted to swing and slide. As shown more especially at Figure 4, this T-coupling 24 is split and a clamping bolt at 25- is pro vided for the purpose of clamping said coupl ng upon the tube 21 when said coupling is to remain stationary. At right angles to the tube 21 an arm 26 is also can ried by said coupling and a bolt at 27 similarly employed for clamping said arm rigidly in connection with said coupling.

Upon the top of the housing 20 a fulcrum member 28 is erected having an arm 29 connected with a push rod 30, which, in turn, is connected with a foot pedal 31. The operationof the foot pedal 31 moves the arm 29 from full line to dotted position, as shown at Figure 1, a spring 32- being rovided for.

' the purpose of producing a yie din action.

The fulcrum member 28 carries a tting 33 clam ing an arm 34 in the manner described for c amping thearm 26.

The arms 26 and 34 res 'ectively carry electrodes 35 and 36 in suc pos1t1on that as the arms 29 and 34 are rocked u on the fulcrum member 28, one of these e ecarm which may be either the arm 26 or 34. This arm is shown as slitted at 40 and 41 at opposite ends, with grooves 42 and .43 for accommodating the electrodes and clamping screws 44 and 45 for clampingsaid electrodes within either slitted end of said arm. It is obvious that the arms may thus be reversed, so that the electrodes may occu y the relation to such'arms as indicate at Figures 1, 7 and 8, to facilitate reaching otherwise inaccessible points within a container, or the like.

Also either of said arms 26 or 34 may be rotated upon its own axis throughout a part of a revolution to positions indicated at Figures 10, 11 and 12, further I facilitating the reaching of inaccessible ite points.

Under some conditions where a considerable amount of similar work is to be performed, instead of employing a single-point electrode u on either of the arms 26 or 34,

an electro e as indicated at 46, having s aced extremities, may be employed upon either of said arms. When so used, it is found desirable to swing the arm 26 laterall to bring its single or its double electrode into'operative position. For this purpose, a collar 47 is employed embracin the tube or rod 21 and c amped thereon y a clamping screw 48. When moved to the dotted position shown at 47' at Figure 1 ages under the fitting 24 and supports said ttmg, preventing its vertical movement u u said tube or rod. This collar 47"is provided with segmental slots 49 and 50 accommodating stops 51 and 52 respective- 1 :which may be properl positioned b tbb adjusting screw 53 to 't the lateral swing of the arm 26 as the exi ncies of work may make necessary or desira 1e. By

employing this manner of supporting and latera limitation of movement, the arm 26 may swing as indicated at Figures 13 and 14, so that-at eitherlimit of its swinging 1 connected through the arm 56 with the fitting 33 and also connected with the arm 23, whereby the transformed current is supplied to the arms 26 and 34.

Limiting screws 57 and 58 are provided 4 for adjusting the throw of the arm 24 upon its fulcrum.

The device as disclosed in said drawing is adapted for such a reat variety of uses that an explanation of its operation in all of its utilities would be voluminous. As one explanation, it might be assumed that it is to be operated for the spot welding of the bottom of a boiler. In this case the boiler may be placed over the arm 26 until the electrode 35 is in position at the bottom of the boiler where the spot welding is to be accomplished. By previously properly adjusting the arms 26 and 34 and the electrodes carried thereby to insure the proper registry of the electrodes, it will be obvious that after the work has been so placed in position the mere depression of the pedal 31 .will cause the electrodes to approach each other into 0 erative relation with the work interposed t erebetween and the welding accom lished in the usual wellknown manner. hen the work to be welded consits of a box, for instance, having angles, a forked electrode as shown at Figure 13 may be employed with a terminal of the electrode in either corner of the box.

By merely swin g the arm 26 laterally, the extremities 0 this interior electrode are brought into position for co -acting with the electrode carried by the arm 34 and the welding accomplished.

What we cla1m is:

1. An electric spot weldin machine comprising a fulcrumed arm an an arm s aced relative thereto and ada ted to swing ater to rmitthe rotation of said arms upon their own axes, means to limit the movement of the swinging movement to position the extremities in operative relation to each other, electrodes carried at the extremities of said arms, and manual means for moving said arms into operative relation.

2. An electric spot welding machine comprising an u rig t su port a cylindrical member r1g1 secure to the support, an

arm carried. the. cylindrical member adapted to be a justed vertically upon said ally, means clampin said arms but adapted justable arm, electrodes carried at the extremities of said arms, and manual means for moving said pivoted arm to bring said electrodes into operative relation.

3. An electric spot avelding machine oom prising a support, a cylindrical member mounted rigidly upon the support, a fitting carried by the cylindrical member, means to vertically adjustably support said fitting to permit lateral movement relative to the cylindricaLmember, means to electively clamp said fitting rigidly at an acquired adjustment, an arm carried by and extending laterally from said fittingand adapted to rotate in said fitting upon its own axis, means for clamping said arm rotatively in said fitting, a second arm fulcrumed on said support in spaced relation to said first-mentioned arm, electrodes carried at the extremities of said arms, and manual means for moving said fulcrumed arms to bring said electrodes into operative relation.

4. An electric spot welding machine comprising a supporting structure, an arm extending laterally from said supporting structure, a member fulcrumed upon said supporting structure, an arm reversibly carried by said fulcruming member adapted to rotate relative to said fulcruming member and upon its own axis, different electrodeclamping means at opposite ends of said-reversible arm, means to clamp either end of said arm rigid relative to said clamping member, electrodes carried at the extremities of said arms, and manual means for moving said fulcruming member and arm carried thereby to bring said electrodes into operative relation.

5. An electric spot Welding'machine comprising a supporting structure, a guide carried rigidly by said supporting structure, a

fitting slidable and rotatable upon said guide, a member I fulcrumed upon said supporting structure, arms inserted in said fitting and said fulcituming member and. extending laterally ii therefrom in spaced relation and proportioned to be reversed in said fittiii and} fulcruming member, =ferent electrode-clamping means at opposi g electrodes carried el mp J means, n ing sai arms to bring said electrodes into operative relation.

6. An electric spot aveldiiig machine comprising a supporting structure, a cylindrical member carried rigidly by said supporting structure upon a vertical iaxis, acollar mounted to slide vertically upon said cylin-' -drical member, means to clamp said collar at a vertically awted position, stops carried by said collar,aparm mounted to swing upon 'said cylindrical,meiiffbe rand be supported by said collar and its Ifibvement limited by said astops, a second arm, means to move said,second arm manually relative to the first mentioned arm, and electrodes carried at the extremitiesofi s'aid arms.

7. An electric spot weldilig machine com-, prising a supporting structiige, a vertically positioned cylindrical member carried rigidly'by said supporting structure, a collar mounted to slide vertically upon said cylindrical member, means to clamp said collar rigidly at an elected vertical adjustment on sald cylindrical member, said collar being provided with arcuate slots, stops slidably mounted in said slots, means to rigidly secure said stops at adjusted positions, an arm I mounted to swing freely upon said cylindrical member and bear upon said collar and its swinging motion limited by said stops, a second arm fulcrumed upon the sup-- FRANK M. OUSHING. WILLIAM L. B. ousnnve. 

